best friends for life- someone who is always there for you, someone you can trust, rely, and depend on. A shoulder to cry on, a mouth to laugh with, an ear to tell secrets too.. Someone who no matter what happens between you guys you will always forgive them and make UP..a bffl is someone you hang out with a talk to and tell more to then regular friends tehre the ultimate friends.. the best and the highest..

Butt-Fucker For Life. The person who will always be the one you like to take it in the butt from. Your favorite companion for anal sex. Not to be confused with Best Friend For Life, though they can be one in the same.

The new terminology for friends.
"Best friends for Life"
Either used to mock shortened computer lingo as in "omfg we are sooo bffls!" or mistakingly said when referring to a friend, can slip out in coversation by accident like LOLs sometimes do.

Jesse: Why are you hanging out with Karen? I thought you hated that bitch?
Mary: Oh god no we bonded in the ladies room the other day and are totally bffls!

"Omg Stacey and Lindsey are like joined at the hip .. they are like over the top bffls!"